[Association between clinical manifestations of infants with human cytomegalovirus infection and glycoprotein B genotype]

Abstract

Objective: To investigate the association between the clinical manifestations of infants with human cytomegalovirus (HCMV) infection and glycoprotein B (gB) genotype.

Methods: Urine samples were obtained from 107 symptomatic infants with HCMV infection confirmed by fluorescence quantitative PCR, 70 male and 37 female, aged 5 d-8 months, and 25 asymptomatic infants with HCMV infection, 16 male and 9 female, aged 21 d-7 months. A fragment of glycoprotein B gene was amplified by nested PCR (nPCR). HCMV gB genotyping was carried out by restriction fragment length polymorphism (RFLP), and some of the amplified DNA fragments were verified by DNA sequencing.

Results: Of the HCMV specimens from 107 infants, 53 were typed as gB group I, 20 as gB II, 18 as gB III, 7 as gB I and gB II, 5 as gB I and gB III, and 4 as gB II and gB III, and gB IV was not found. The HCMV gB genotype from 53 infants with hepatic function damage showed that 36 were classified as gB I, 5 as gB II, 7 as gB III, 3 as gB I and gB II, and 2 as gB I and gB III. The gB I genotype was more common among the infants with hepatic function damage (P < 0.05). The distribution of gB genotype in the asymptomatic infants was as follow: gB I, 10/25; gB II, 6/25; gB III, 8/25; and gB I and gB II, 1/25. The homology of PCR products of HCMV gB in 24 strains amplified compared with the sequences of prototype strains in GenBank was from 97.06% to 99.64%.

Conclusion: RFLP analysis of HCMV gB genotype is definite and reliable. The gB I genotype is more common among the infants with hepatic function damage.